Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: jamie on 11 February 2007, 21:04:47

Title: Speed Signal
Post by: jamie on 11 February 2007, 21:04:47
I have noticed a few posts concerning errors related to the Speed Signal.  For reference, I scoped it today and found it to be 10Hz at 1mph, the picture shows the signal "held" when car was at around 50mph.  (2000 3L with 17" wheels, assume its the same for all wheel sizes and adjusted at the speedo side via tech2).  Interesting as it suggests a slight error with Speedo reading 50mph and signal suggesting 51.9mph  :)


(http://www.iecd.co.uk/ScratchPad/11-02-07_2039.jpg)[/img]
Title: Re: Speed Signal
Post by: Marks DTM Calib on 11 February 2007, 21:10:21
Is it realy only 6V peek.....
Title: Re: Speed Signal
Post by: Marks DTM Calib on 11 February 2007, 21:11:00
Ow yes....what does it read when stationary...?
Title: Re: Speed Signal
Post by: TheBoy on 11 February 2007, 21:13:31
The MID is set with pulse/km (the 5 digit number if you hold both S and R for a second or 2). Presumably speedo get same signal?
Title: Re: Speed Signal
Post by: jamie on 11 February 2007, 21:18:43
It can read around +12V!!, 0V or 6V at standstill.  I can understand why it can be high or low.  Strange though why it swings up to 12V at standstill sometimes and sometimes 6V  

So its not possible to really check with a DVM, a capacitor, LED and a couple of resistors could make a simple go/nogo tester.
Title: Re: Speed Signal
Post by: Marks DTM Calib on 12 February 2007, 08:09:28
Quote
It can read around +12V!!, 0V or 6V at standstill.  I can understand why it can be high or low.  Strange though why it swings up to 12V at standstill sometimes and sometimes 6V  

So its not possible to really check with a DVM, a capacitor, LED and a couple of resistors could make a simple go/nogo tester.


Blimey.....they let the output float....surprised there is not a weak keeper on the output or at least one of the inputs!
Title: Re: Speed Signal
Post by: jamie on 12 February 2007, 08:58:57
Or of course, mine could be damaged, but the swing is good enough for everything to work.

I will check the signal today on another car, if possible.